Version: 0.8.2-1~getdeb2

Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux. The project is geared towards providing addictive arena shooter gameplay which is all spawned and driven by the community itself. Xonotic is a direct successor of the Nexuiz project with years of development between them, and it aims to become the best possible open-source FPS (first-person-shooter) of its kind.

Available for Ubuntu:
16.10

Version: 0.4.7.1-1~getdeb1

Lutris is a gaming platform for GNU/Linux. Its goal is to make gaming on Linux as easy as possible by taking care of installing and setting up the game for the user. The only thing you have to do is play the game. It aims to support every game that is playable on Linux.

Available for Ubuntu:
16.10

Version: 1.3-1~getdeb1

Galaxy is a free Linux computer program which simulates the motion of stars under the influence of gravity. Create a field of random stars to begin with, then watch the stars move as they are accelerated by their mutual gravitational attractions. You can vary the number of stars and the strength of gravity. Watch how the attractive forces accelerate individual stars and send them careening in new directions. Watch how large groups of stars develop into interesting patterns over time.

Available for Ubuntu:
16.04, 16.10, 17.04

Version: 1.5.3-1~getdeb2~yakkety

Tales of Maj'Eyal (ToME) is a free, open source roguelike RPG, featuring tactical turn-based combat and advanced character building. Play as one of many unique races and classes in the lore-filled world of Eyal, exploring random dungeons, facing challenging battles, and developing characters with your own tailored mix of abilities and powers.